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针对某660 MW超临界空冷机组锅炉两侧主汽温度偏差大,主汽温度达不到额定值的问题,提出了通过配风优化和提高磨煤机出口温度的解决方案。通过改变氧量、燃尽风开度和水平摆角、锅炉负荷等因素,研究不同工况下汽温和NOx排放浓度的变化规律,最终确定了燃烧器摆角和汽温变化的定量关系。试验结果表明,对于未经过燃烧器改造的锅炉,通过配风优化,在保证锅炉安全性的前提下,主汽温度达到571℃,两侧汽温偏差控制在5℃之内,锅炉效率提高0.3%,脱硝入口NOx浓度降低30 mg/m3。
Aiming at the problem that the temperature of the main steam on both sides of a 660 MW supercritical air-cooled unit has a large temperature deviation and the main steam temperature does not reach the rated value, a solution is proposed to optimize and increase the outlet temperature of the coal mill through the air distribution. By changing the oxygen amount, the opening of the open air and the horizontal swing angle, the load of the boiler and other factors, the variation law of the steam temperature and NOx emission concentration under different operating conditions was studied. Finally, the quantitative relationship between the burner swing angle and the steam temperature was determined. The test results show that the main steam temperature reaches 571 ℃, the steam temperature deviation on both sides is controlled within 5 ℃ and the boiler efficiency increases by 0.3 %, NOx concentration in denitrification inlet is reduced by 30 mg / m3.